Spiral groove rifle magazine



2 Sheets-Sheet l I-l. n.

F. A. DICKINSON SPIRAL GROOVE RIFLE MAGAZINE Filed June 4, 1955 4j@ /V534C 5 ATTO R N EYS BY W' Dec. 22, 1936.

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Dec. 22, 1936. F. A. DlcKlNsoN 2,064,888

SPIRAL GROOVE RIFLE MAGAZINE Filed June 4, 1935 2 Sheets-Sheet 2 L, Il?4:03 3l 2.9 ,97

www y Il [UN 1. TED STATES i PTE 'r QSPIRAL GROOVE RIFLE MAGAZINE FredA. Dickinson!Y St. Louis, Mo.

Application June 4, 1935, Serial No. 24,961

1 Claim.

i This invention relates to magazines for fire- -v`arms" andV has forthe primary object the provision ofi-a device of this character whichwill accommodate a large number of cartridges and iwill feflicien-tlyfeed the cartridges tothe gun asuSed-by the latter and is so constructedthat it may be easily andquickly applied and removed` from the stock ofthe gun and may be readily filled or replenished with cartridges whenemptied of the preceding loading.

With these andother objects in view, this in- `venticn: consists incertain novel features of construction, combination and arrangement ofparts which i i fFigure'l' isa fragmentary vertical sectional viewshwing aimagazine constructed in accordance with my invention andillustrating the same applied tc a gun stock.

'Figure 2` is a sectional view taken on the line 2--2 of Figure 1. i

Figure 3 is a fragmentary sectional i view showing the `connectionbetween the driving plate of the magazine and the clock type springemployed as the driving medium.

Figure-4 `Y`isfa-fside elevation illustrating a ratchet mechanismemployed for holding the spring against unwinding and which will permiteasy and quick winding of the spring.

Figure 5 is a plan View, partly in section, showing the driving plate.

Figure 6 is a detail sectional view showing the connection between thedriving plate and the follower.

Figure '7 is a detail sectional view showing a portion of a connectingblock operating in a slot of the driving plate.

Figure 8 is a disrupted perspective View showing the connecting block.

Figure 9 is a fragmentary sectional View taken on the line 9-9 of Figure1.

Figure 1G is a fragmentary sectional view showing the connecting blockoccupying a position in the slot Aof the driving plate when the magazinehas been exhausted of cartridges.

Figure 11 is a fragmentary plan view illustrating a portion of thefollower.

Figure 12 is a fragmentary sectional View showing a manually actuatedlatch for securing the driving plate against action by the drivingspring.

Figure 13 is a fragmentary plan view, partly in section, showing akeeper operating in connection with the latch.

Figure 14 is a plan view, partly in section, showing an ammunition tube.

Figure 15 is a plan view illustrating a retaining stud bolt for thetube.

Figure 16 is an exploded View showing a guide block for the tube.

Referring in detail to the drawings, the numeral I indicates a gun stockin which is formed a chamber 2 for the reception of a magazine andleading from this chamber is a passage 3 connecting with a tube 4removably mounted in a bore 5 formed in the gun stock `and which boreopens outwardly through the end of the stock adapted for connection tothe usual breech block of the gun (not shown). One end of the tube isexternally screw threaded, as

f shown at 6, and projects beyond the end of the stock so that it may bethreaded to the breech .block for eiciently connecting `the stock to thegun while the opposite end of the tube is internally screw threaded andcommunicates with the chamber 2. A stud bolt 1 is threaded intok thelast-named end of the tube for the purpose of supporting within saidtube and adjacent to an entrance 8 thereof a guide block 9. The block 9is provided with a tapered face IIl underlying the entrance 8 for thepurpose of directing cartridges through the tube received from thepassage 3. The chamber 2 opens outwardly through the lower or under sideof the gun stock for the partial reception of a magazine housing II.

The housing II includes a plate I2 oiset, as shown at I3, to form aspring chamber I4. The plate I2 is provided with a screw threaded socketto receive a screw threaded set bolt I5 carried by the gun stock forreleasably securing the housing II in the chamber 2. A spring shaft I6is rotatably supported by the offset portion I3 of the plate I2 and hasremovably and rotatably mounted thereon a driving plate I'I adapted toabut anges I8 on the plate I2. The other end of the shaft projectsoutwardly of the spring casing and is provided with angularly relatedfaces on which is secured a ratchet gear I 9 engaged by spring presseddogs 20 pivotally mounted to the offset I3 of the plate I3. Saidlast-named end of the shaft projects beyond the ratchet gear to receivea key or like device for rotating the shaft in a direction for winding aclock type spring 20 located in the chamber I4 and has one end securedto said shaft. The other end of the spring is connected to the drivingplate by a medium which will be hereinafter more fully described. Afinger piece 2| having a screw threaded shank 22 extends through thedriving plate and threads to the shaft for the purpose of rotatably andreleasably mounting the driving plate to the shaft. A protecting plate23 is mounted on the shaft between the driving plate and the spring 20.

The flanges I8 on the plate are of spiral formation forming on saidplate a spiraled chamber 24, the outer end of which communicates withthe passages 3. The spiral chamber accommodates a maximum number ofcartridges, as shown end' engaging a connecting block 28, the latterhaving a pin 29 extending a short distance into the coil spring. Thecoil spring cooperating with the block andthe abutment forms a followerof a yieldable construction. The follower operates in the spiral chamberand the block 28 thereof? is provided with grooves 30 to receive walls3| of a slot 32 formed in the driving plate. The slot 32 is angularlydisposed relative to the journal of the driving plate and opensoutwardly through the periphery of said driving plate at one end and itsopposite end terminates in a laterally eX- tending branch 33. The driveplate is connected 35', to the outer end of the clock type spring by a Ythereof is providedlwith relatively spaced aper- -tures 35, any one ofwhich is adapted to receive a spring pressed pin 36`slidably mounted tothe 'plate I2 for the purpose of holding the driving plate againstrotation under the action of the springy 20. The pin^36 is equipped witha finger piece 31 having an offset 38 and mounted to the plate I2 is anoffset 39. The offsets 38 and 39 when engaged will retain the pin 36 ina position disengaged from any one of the apertures of the drivingplate, consequently freeing the driving plate for rotation under theinuence of the spring 20. By turning the finger piece the offset 38 maybe disengaged from the offset 39 and when the pin is manually releasedit may enter one of the apertures 35 and lock the driving plate againstrotation.

A stop pin is carried by the gun stock I for limiting the movement ofthe follower, that is, after said follower has ejected the lastcartridge of the magazine into the gun proper or ring chamber thereof.

In operation, after the magazine has been loaded and applied to thestock, the pin 36 is re leased from the driving plate and as the gun isred, the cartridges are progressed into the gun by the action of thespring 20. A device constructed in accordance with the foregoing willeiciently operate to supply the gun with ammunition as needed and iscapable of holding a maximum amount of ammunition obviating thenecessity of the user carrying additional ammunition in the garment orthe necessity of reloading the magazine at frequent intervals.

Having described the invention, I claim:

In combination with a gun stock having a chamber and an ammunitionpassage communicating with said chamber, a plate projecting into thechamber and having an offset to provide a spring chamber, meansdetachably securing the plate to the gun stock, a spring shaft rotatablysupported in the spring chamber, a spring for rotating said shaft, aspiral flange formed on one face Yof the plate, a drive plate rotatablysupported by the shaft and free to rotate relative thereto andcontacting said spiral flange for cooperating therewith and with thefirst plate to form a spiral passage to receive ammunition and havingcommunication with the passage of the gun stock, a follower slidable inthe spiral passage, said drive plate having a slot opening outwardlythrough an edge thereof, a block having opposite faces grooved toreceive the walls of the slot and connected to the follower, and meansfor releasably securing the drive plate against rotation.

FRED A. DICKINSON.

